Photographic shutter.



P. 1. MARKS.

PHOTOGRAPH? SHUTTER.

APPLICATION FILED JULY 27. 1916.

1,257,624. Patented Feb. 26,1918.

his ATTORNEYS s'rATEs PATENT omen.

PAUL J. MARKS, OI ROCHESTER, NEW YORK, ASSIGNOB T0 EASTMAN KODAKCOKPAKY,

OF ROCHESTER, NEW

YORK, A CORPORATION OF NEW YORK.

To all whom it-may concern:

Be it known that I, PAUL J. MARKS, of Rochester, in the county of Monroeand State of New York, have invented certain new and useful Improvementsin Photographic Shutters; and I do hereby declare the followin to be afull, clear, and exact description 0 the same, reference being had tothe accompanying drawin forming a part of this specification, an to thereference numerals marked thereon.

My present invention relates to photography and more particularly tophotographic shutters and it has for its object to provide a simple,efficient and convenient shutter of the professional t pe which are usedlargely by professional p otographers in connection more particularlywith studio apparatus. The shutter is designed for use in instances inwhich lens capping would otherwise be employed and the improvements aredirected in part toward providing a quick acting shutter for timedexposures of the construction permitting it to be readily placed underthe control of the usual flexible operating device. To these and otherends the invention resides in certain improvements and combinations ofparts all as will be hereinafter more fully described, the novelfeatures being pointed out in the claims at the end of thespecification.

In the drawings: I

Figure '1 is a front elevation of the shutter in closed position withthe cover of the casing removed;

ig. 2 is a similar view showing the shutter open;

Fig. 3 is an enlarged horizontal section taken substantially on the line3-3 of Fig. 1;

ig. 4 is an enlarged detail section through the stud connecting anactuating lever with the shutter curtain, and

Fig. 5 is an enlarged detail section through the pivot of anactuatinglever.

Similar reference numerals throughout the several views indicate thesame parts.

The shutter mechamsm is carried within the shutter case 1 having a cover2 which latter and "the casing are provided with registering openings 3and 4 constituting the shutter aperture. Two shutter members 5 and 6 areprovided to open and close the shutter aperture and each comprises afolding flexible curtain preferably made of light Specification ofLetters Patent.

Application flied July 27, 1

Patented Feb. 26, 1 918.

916. sermno. 111,021.

rubber cloth. One end of the curtain in each instance is fixed to thecasing 1 at one side of the opening 4 and for this purpose,

its edge may be held within a bindinglstrip 7 fastened down by screws 8Theo or or free end of the curtain is,= in each instance, provided witha stiffening plate 9 over which the margin of the cloth is doubled andriveted in or otherwise secured in the plates are pivot studs 10 and 10,the former being best shown in Fig. 4. The said ivot studs are journaledin sleeves 11v an 11 riveted to the outer ends of actuating levers 1212, respectively, and the stud is held in the sleeve, in each instance,by a confining screw 13 threaded in the stud and engaging the oppositeface of the lever.

he levers 12 and 12 are oppositely acting and are removably carried onpivot studs 14,-, riveted in the casing 1 at 15, as shown in Fig. 5. Thelevers are provided with sleeves 16 secured thereto by screws 17 whichengage over the studs 1i and are held thereon by confining screws 18.The levers have a normal tendency to move toward each other and draw thecurtains 5 and 6 across the shutter aperture 4 under the influence of aspring 19 connecting them. For the purpose of opening the curtains, asshown in Fig. 2, the lever 12 is provided on the lower side of its pivotwith an extension arm 20 projecting through an L-shaped slot 21 in aside wall of the casing 1. The said arm 20 is notched at 22 to form ahook with which may be engaged a loop on the end of a flexible operatingcable 23 of a familiar type housed within a tube 24 having a collar 25held in a clip 26 on the casing 1. It will be seen that as the cable 23is pulled, it will rock the lever 12 to which it is attached, to theleft and draw back the flexible curtain 5. This movement is alsocommunicated to the other lever 12 through the medium of a connectingrod 27 having one end pivoted at 28 below the pivot of lever 12 and theother end pivoted at 29 to lever 12 above its pivot.

The curtains or shutter members close under the action of the spring 19which normally' holds them closed and are opene against its tension bypulling on the cable 23 and holding it so that the levers Will beseparated as in Fig. 2 for the desired period through which the shutteris to remain open. The size Of he casing 1 is such that 110 the curtains5 and 6 have room to fold clear of the aperture 4 as shown in Fig. 2 andbeing very light and flexible, they adapt themselves to the spaceafforded. The studs 10 and 10 by means of which the levers are connectedto the stifl'ening devices 9 of the curtain, are made long enough tosubstantially offset the general plane of the curtain on the one hand,from the general plane of the levers, on the other, so that the twopairs of devices will work free of each other and the stud 10 is longerthan the stud 10 to bring the curtain 6 into overlapping relationshipwith the curtain 5. when closed, overlap each other at the1r stifiedges, as shown in Fig. 3 and the said pivotal connection may act asstops for limiting their movement toward each other, although thismovement, if desired, may be limited by the lengths of the curtainsthemselves. In any event, the curtains should be substantially flat whenclosed by being drawn taut or nearly taut which causes the stiffenededges at their outer ends to come parallel with each other.

1 claim as my invention 1. In a photographic shutter, the combinationwith a shutter casing having an aperture and a folding flexible curtainhaving one end fixed to the casing at one side of the shutter aperture,of an actuator on the casing connected to the other end of the cur tainto move it across the aperture.

2. In a photographic shutter, the combina tion with a shutter casinghaving an aperture and a folding flexible curtain having one end fixedto the casing at one side of the shutter aperture and a stiffeningdevice at the opposite free end, of an actuator on the casing connectedto said last mentioned end of the curtain to move it back and forthacross the aperture.

3. In a photographic shutter, the combination with a shutter casinghaving an aperture and a folding flexible curtain having one end fixedto the casing at one side of the shutter aperture and a stifleningdevice at the other free end, of an actuating lever on the casingpivoted to the stiflening device to move the curtain back and forthacross the aperture.

4. In a photographic shutter, the combination with a shutter casinghaving an aper- The curtains ture and a foldin flexible curtain havinone end fixed to t e casing at one side 0 65 the shutter aperture and astiffening device at the other free end, of an actuating lever on thecasing and a stud projecting there from and connected to the stiffeningdevice to form a pivot bearing for the curtain ofi set from the leverthrough the medium of which the curtain may be operated back and forthacross the aperture.

5. In a photographic shutter, the combination with a shutter casinghaving an aperture and a pair of folding flexible curtains each havingone end fixed to the casin at one side of the shutter aperture and a stiening device at the other free end, of a pair of oppositely actingactuating levers on the casing connected to the respective free ends ofthe curtains, a spring connecting the levers to cause them to normallyclose the curtain together across the aperture and op erating means forspreading the levers and folding the curtains 'at the sides of theaperture.

(3. In a photographic shutter, the combination with a shutter casinghaving an aperture and a pair of folding flexible curtains each havingone end fixed at one side of the shutter aperture, and a stiffeningdevice at the other free end, of an actuating lever for each curtainmounted on the casing, and a. stud projecting from each lever andconnected to the stiflening device of its respec tive curtain so thatthe general plane of the curtains and that of the levers are relativelyoffset, the levers being oppositely acting and one of the studs beingadapted to act as a stop with which the stifl'ening device 01" the othercurtain cooperates to limit the movement of the curtains toward eachother as they pass across the aperture to close it.

7 In a photographic shutter, the combination with a shutter casinghaving an aperture and a flexible curtain having a free end adapted tomove back and forth across the shutter aperture, of an actuating leveron the casing connected to such free end of the 100 curtain.

PAUL J. MARKS.

Witnesses:

M. JOSEPH SULLIVAN, EDITH WATERSTRAAT.

